Fix Clang-tidy modernize-use-nullptr warnings in headers and generated files; other minor cleanups.

By Eugene Zelenko!

Differential Revision: http://reviews.llvm.org/D13187

llvm-svn: 248828
diff --git a/clang/lib/CodeGen/CGDebugInfo.h b/clang/lib/CodeGen/CGDebugInfo.h
index cce7bb2..7ae547b 100644
--- a/clang/lib/CodeGen/CGDebugInfo.h
+++ b/clang/lib/CodeGen/CGDebugInfo.h
@@ -326,7 +326,7 @@
                                          llvm::Value *storage,
                                          CGBuilderTy &Builder,
                                          const CGBlockInfo &blockInfo,
-                                         llvm::Instruction *InsertPoint = 0);
+                                         llvm::Instruction *InsertPoint = nullptr);
 
   /// Emit call to \c llvm.dbg.declare for an argument variable
   /// declaration.
@@ -593,4 +593,4 @@
 } // namespace CodeGen
 } // namespace clang
 
-#endif
+#endif // LLVM_CLANG_LIB_CODEGEN_CGDEBUGINFO_H
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index 5f40d41..b1071a4 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -715,7 +715,7 @@
 
   /// Return the address of the given function. If Ty is non-null, then this
   /// function will use the specified type if it has to create it.
-  llvm::Constant *GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty = 0,
+  llvm::Constant *GetAddrOfFunction(GlobalDecl GD, llvm::Type *Ty = nullptr,
                                     bool ForVTable = false,
                                     bool DontDefer = false,
                                     bool IsForDefinition = false);
@@ -1184,7 +1184,7 @@
 
   // FIXME: Hardcoding priority here is gross.
   void AddGlobalCtor(llvm::Function *Ctor, int Priority = 65535,
-                     llvm::Constant *AssociatedData = 0);
+                     llvm::Constant *AssociatedData = nullptr);
   void AddGlobalDtor(llvm::Function *Dtor, int Priority = 65535);
 
   /// Generates a global array of functions and priorities using the given list
@@ -1251,4 +1251,4 @@
 }  // end namespace CodeGen
 }  // end namespace clang
 
-#endif
+#endif // LLVM_CLANG_LIB_CODEGEN_CODEGENMODULE_H
diff --git a/clang/lib/CodeGen/TargetInfo.h b/clang/lib/CodeGen/TargetInfo.h
index 95275d5..87b4704 100644
--- a/clang/lib/CodeGen/TargetInfo.h
+++ b/clang/lib/CodeGen/TargetInfo.h
@@ -47,7 +47,7 @@
 
 public:
   // WARNING: Acquires the ownership of ABIInfo.
-  TargetCodeGenInfo(ABIInfo *info = 0) : Info(info) {}
+  TargetCodeGenInfo(ABIInfo *info = nullptr) : Info(info) {}
   virtual ~TargetCodeGenInfo();
 
   /// getABIInfo() - Returns ABI info helper for the target.
@@ -219,6 +219,6 @@
                                        llvm::StringRef Value,
                                        llvm::SmallString<32> &Opt) const {}
 };
-}
+} // namespace clang
 
-#endif
+#endif // LLVM_CLANG_LIB_CODEGEN_TARGETINFO_H